media: qcom: camss: Move VFE power-domain specifics into vfe.c

Moving the location of the hooks to VFE power domains has several
advantages.

1. Separation of concerns and functional decomposition.
   vfe.c should be responsible for and know best how manage
   power-domains for a VFE, excising from camss.c follows this
   principle.

2. Embedding a pointer to genpd in struct camss_vfe{} meas that we can
   dispense with a bunch of kmalloc array inside of camss.c.

3. Splitting up titan top gdsc from vfe/ife gdsc provides a base for
   breaking up magic indexes in dtsi.

Suggested-by: Matti Lehtimäki <matti.lehtimaki@gmail.com>
Tested-by: Matti Lehtimäki <matti.lehtimaki@gmail.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

1 files changed, 36 insertions, 31 deletions

diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c
index ed01a3ac7a38..35918cf837bd 100644
--- a/drivers/media/platform/qcom/camss/camss.c
+++ b/drivers/media/platform/qcom/camss/camss.c
@@ -1486,7 +1486,9 @@ static const struct media_device_ops camss_media_ops = {
 
 static int camss_configure_pd(struct camss *camss)
 {
+	const struct camss_resources *res = camss->res;
 	struct device *dev = camss->dev;
+	int vfepd_num;
 	int i;
 	int ret;
 
@@ -1506,45 +1508,41 @@ static int camss_configure_pd(struct camss *camss)
 	if (camss->genpd_num == 1)
 		return 0;
 
-	camss->genpd = devm_kmalloc_array(dev, camss->genpd_num,
-					  sizeof(*camss->genpd), GFP_KERNEL);
-	if (!camss->genpd)
-		return -ENOMEM;
+	/* count the # of VFEs which have flagged power-domain */
+	for (vfepd_num = i = 0; i < camss->vfe_total_num; i++) {
+		if (res->vfe_res[i].has_pd)
+			vfepd_num++;
+	}
 
-	camss->genpd_link = devm_kmalloc_array(dev, camss->genpd_num,
-					       sizeof(*camss->genpd_link),
-					       GFP_KERNEL);
-	if (!camss->genpd_link)
-		return -ENOMEM;
+	/*
+	 * If the number of power-domains is greater than the number of VFEs
+	 * then the additional power-domain is for the entire CAMSS block.
+	 */
+	if (!(camss->genpd_num > vfepd_num))
+		return 0;
 
 	/*
 	 * VFE power domains are in the beginning of the list, and while all
 	 * power domains should be attached, only if TITAN_TOP power domain is
 	 * found in the list, it should be linked over here.
 	 */
-	for (i = 0; i < camss->genpd_num; i++) {
-		camss->genpd[i] = dev_pm_domain_attach_by_id(camss->dev, i);
-		if (IS_ERR(camss->genpd[i])) {
-			ret = PTR_ERR(camss->genpd[i]);
-			goto fail_pm;
-		}
+	camss->genpd = dev_pm_domain_attach_by_id(camss->dev, camss->genpd_num - 1);
+	if (IS_ERR(camss->genpd)) {
+		ret = PTR_ERR(camss->genpd);
+		goto fail_pm;
 	}
-
-	if (i > camss->res->vfe_num) {
-		camss->genpd_link[i - 1] = device_link_add(camss->dev, camss->genpd[i - 1],
-							   DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME |
-							   DL_FLAG_RPM_ACTIVE);
-		if (!camss->genpd_link[i - 1]) {
-			ret = -EINVAL;
-			goto fail_pm;
-		}
+	camss->genpd_link = device_link_add(camss->dev, camss->genpd,
+					    DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME |
+					    DL_FLAG_RPM_ACTIVE);
+	if (!camss->genpd_link) {
+		ret = -EINVAL;
+		goto fail_pm;
 	}
 
 	return 0;
 
 fail_pm:
-	for (--i ; i >= 0; i--)
-		dev_pm_domain_detach(camss->genpd[i], true);
+	dev_pm_domain_detach(camss->genpd, true);
 
 	return ret;
 }
@@ -1566,18 +1564,25 @@ static int camss_icc_get(struct camss *camss)
 	return 0;
 }
 
-static void camss_genpd_cleanup(struct camss *camss)
+static void camss_genpd_subdevice_cleanup(struct camss *camss)
 {
 	int i;
 
+	for (i = 0; i < camss->vfe_total_num; i++)
+		msm_vfe_genpd_cleanup(&camss->vfe[i]);
+}
+
+static void camss_genpd_cleanup(struct camss *camss)
+{
 	if (camss->genpd_num == 1)
 		return;
 
-	if (camss->genpd_num > camss->res->vfe_num)
-		device_link_del(camss->genpd_link[camss->genpd_num - 1]);
+	camss_genpd_subdevice_cleanup(camss);
+
+	if (camss->genpd_link)
+		device_link_del(camss->genpd_link);
 
-	for (i = 0; i < camss->genpd_num; i++)
-		dev_pm_domain_detach(camss->genpd[i], true);
+	dev_pm_domain_detach(camss->genpd, true);
 }
 
 /*